FreshPatents.com Logo
stats FreshPatents Stats
1 views for this patent on FreshPatents.com
2012: 1 views
Updated: August 12 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

Follow us on Twitter
twitter icon@FreshPatents

Display device having touch panel

last patentdownload pdfdownload imgimage previewnext patent


Title: Display device having touch panel.
Abstract: The present invention provides a display device having a touch panel including: a display panel; a capacitance-type touch panel arranged on the display panel; and a front panel arranged on the capacitance-type touch panel, wherein the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes, the capacitance-type touch panel and the front panel are attached to each other at peripheral portions of the capacitance-type touch panel using adhesives, a conductive film that is provided so as to surround an effective touch area of the capacitance-type touch panel is provided on the uppermost layer of the capacitance-type touch panel, predetermined electric potential is supplied to the conductive film, and the conductive film overlaps peripheral portions of the effective touch area of the capacitance-type touch panel in planar view. ...


Browse recent Hitachi Displays, Ltd. patents - ,
Inventor: Kouji HAYAKAWA
USPTO Applicaton #: #20120092292 - Class: 345174 (USPTO) - 04/19/12 - Class 345 


view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120092292, Display device having touch panel.

last patentpdficondownload pdfimage previewnext patent

CLAIM OF PRIORITY

The present application claims priority from Japanese Patent Application JP 2010-231091 filed on Oct. 14, 2010, the content of which is hereby incorporated by reference into this application.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display device having a capacitance-type touch panel, and particularly to a technique that is effective in preventing false operations at peripheral portions of the touch panel.

2. Description of the Related Art

A display device equipped with a device (hereinafter, also referred to as a touch sensor or a touch panel) for inputting information on a display screen with a touch operation (touch and press operation, hereinafter, simply referred to as touch) using a finger of a user or a pen is used in mobile electronic devices such as PDAs and mobile terminals, a wide variety of home electric appliances, automated teller machines, and the like. There have been known a resistive film-type touch panel for detecting changes in resistance values at a touched portion, a capacitance-type touch panel for detecting changes in capacity at a touched portion, and an optical sensor-type touch panel for detecting changes in the amount of light.

For example, Japanese Unexamined Patent Application Publication No. 2003-511799 discloses such a capacitance-type touch panel. In the capacitance-type touch panel disclosed in

Japanese Unexamined Patent Application Publication No. 2003-511799, electrodes (X-electrodes) for detection in the vertical direction and electrodes (Y-electrodes) for detection in the horizontal direction that are arranged in a two-dimensional matrix are provided to detect the capacity of each electrode with an input processor. In the case where a surface of the touch panel is touched with a conductor such as a finger, the capacity of each electrode is increased. Thus, the increase is detected by the input processor and the input coordinates are calculated on the basis of a signal of changes in capacity detected at each electrode.

As a general structure of a conventional capacitance-type touch panel, a front panel is entirely attached to a front surface of the capacitance-type touch panel using adhesives. The front panel is formed on the uppermost layer and is accordingly exposed. Thus, the front panel is scratched or tainted, and needs to be exchanged.

However, when exchanging the front panel, the touch panel also needs to be exchanged in the conventional structure. Thus, there have been requests to exchange only the front panel. In order to respond to the requests, it is only necessary to attach the front panel and the capacitance-type touch panel to each other only at peripheral portions, and thus only the front panel can be easily exchanged with this structure.

However, in the capacitance-type touch panel with the structure in which the front panel and the touch panel are attached to each other only at the peripheral portions, when the front panel is pressed relatively hard, the interval between the front panel and the touch panel becomes narrow or wide because the peripheral portions of the touch panel are fixed to the front panel using the adhesives.

In this case, the capacitance-type touch panel also detects changes in the thickness of an interval layer (a so-called air layer) between the front panel and the touch panel, and thus false reaction possibly occurs at the peripheral portions of the touch panel, leading to false operations.

SUMMARY

OF THE INVENTION

The present invention has been achieved to solve the problems of the conventional technique, and an object thereof is to provide a technique enabling to prevent false operations at peripheral portions of a touch panel in a display device having a capacitance-type touch panel in which a front panel and the touch panel are attached to each other only at the peripheral portions.

The above and other objects and novel characteristics of the present invention will become apparent from the description of the specification and the accompanying drawings.

The followings are representative summarized aspects of the present invention disclosed in this application.

In order to achieve the above-described object, the present invention provides a display device having a touch panel including: a capacitance-type touch panel arranged on a display panel; and a front panel arranged on the capacitance-type touch panel, wherein the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes, the capacitance-type touch panel and the front panel are attached to each other at peripheral portions of the capacitance-type touch panel using adhesives, a conductive film that is provided so as to surround an effective touch area of the capacitance-type touch panel is provided on the uppermost layer of the capacitance-type touch panel, predetermined electric potential (for example, ground electric potential) is supplied to the conductive film, and the conductive film overlaps peripheral portions of the effective touch area of the capacitance-type touch panel in planar view.

In the present invention, end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 3 mm to 5 mm of the peripheral portions of the effective touch area of the capacitance-type touch panel in planar view.

In the present invention, wirings coupled to the plurality of X-electrodes and Y-electrodes are formed outside the effective touch area of the capacitance-type touch panel, and the end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 5 mm from connection portions between the plurality of X-electrodes and Y-electrodes and the wirings in planar view.

In the present invention, the end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 3 mm to 5 mm from the adhesives in planar view.

In the present invention, a slit is provided across the conductive film.

The followings are summarized effects obtained from representative aspects of the present invention disclosed in this application.

According to the present invention, it is possible to prevent false operations at peripheral portions of a touch panel in a display device having a capacitance-type touch panel in which a front panel and the touch panel are attached to each other only at the peripheral portions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram for showing an outline configuration of a display device having a touch panel according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of main parts for explaining the display device having a touch panel according to the embodiment of the present invention;

FIG. 3 is a diagram for showing a state in which a flexible print substrate is coupled to a touch panel;

FIG. 4 is a cross-sectional view for showing an adhesion state between a front panel and the touch panel in a conventional display device having a touch panel;

FIG. 5 is a graph for explaining a principle of a touch detection method in the conventional display device having a touch panel;

FIG. 6 is a diagram for explaining false operations at peripheral portions in the conventional display device having a touch panel;

FIG. 7 is a cross-sectional view for showing an adhesion state between the front panel and the touch panel in the display device having a touch panel according to the embodiment of the present invention;

FIG. 8 is a plan view for showing an electrode pattern of the capacitance-type touch panel in the display device having a touch panel according to the embodiment of the present invention;

FIG. 9 is a diagram for explaining a shield electrode in the display device having a touch panel according to the embodiment of the present invention

FIG. 10 is a cross-sectional view for showing a cross-sectional structure taken along the line A-A′ of FIG. 8;

FIG. 11 is a cross-sectional view for showing a cross-sectional structure taken along the line B-B′ of FIG. 8;

FIG. 12 is a cross-sectional view for showing a cross-sectional structure of another example of the capacitance-type touch panel shown in FIG. 8 and for showing a cross-sectional structure taken along the line A-A′ of FIG. 8;

FIG. 13 is a cross-sectional view for showing a cross-sectional structure of still another example of the capacitance-type touch panel shown in FIG. 8 and for showing a cross-sectional structure taken along the line B-B′ of FIG. 8;

FIG. 14 is a cross-sectional view for showing a cross-sectional structure of still another example of the capacitance-type touch panel shown in FIG. 8 and for showing a cross-sectional structure taken along the line A-A′ of FIG. 8; and

FIG. 15 is a cross-sectional view for showing a cross-sectional structure of still another example of the capacitance-type touch panel shown in FIG. 8 and for showing a cross-sectional structure taken along the line B-B′ of FIG. 8.

DETAILED DESCRIPTION

OF THE EMBODIMENT

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

It should be noted that constitutional elements having the same functions are given the same reference numerals in the all drawings for explaining the embodiment, and the explanations thereof will not be repeated. In addition, the following embodiment does not limit the constitution of the claims of the present invention.

FIG. 1 is a diagram for showing an outline configuration of a display device having a touch panel according to the embodiment of the present invention.

In FIG. 1, the reference numeral 400 denotes a touch panel . The touch panel 400 includes X-electrodes and Y-electrodes for detection of capacity. In the drawing, for example, four X-electrodes (X1 to X4) and four Y-electrodes (Y1 to Y4) are illustrated, but each number of electrodes is not limited to 4.

The touch panel 400 is installed on a front surface of a display device 600. Thus, when a user watches an image displayed on the display device 600, it is necessary to allow the displayed image to transmit through the touch panel 400. Accordingly, the touch panel 400 is desirably high in the light transmission rate.

The X-electrodes and the Y-electrodes of the touch panel 400 are coupled to a capacity detector 102 though detection wirings 201. The capacity detector 102 is controlled by a detection controlling signal 202 output from a controller 103. The X-electrodes X1 to X4 used as transmission electrodes (driving electrodes) sequentially apply pulses and the Y-electrodes Y1 to Y4 are used as reception electrodes to measure capacity between the electrodes at each intersecting point of the electrodes. A capacity detecting signal 203 that is changed depending on the capacitance value of each intersecting point between the electrodes is output to the controller 103.

As working data necessary for a touch detection process performed by the controller 103, a memory 4 records therein a reference value 41, a measured value 42, and a signal value 43 for each intersecting point between the electrodes (X-electrodes and Y-electrodes) and stores therein a touch status management table 44.

The reference value 41, the measured value 42, and the signal value 43 are two-dimensional sequence data in which the number of X-electrodes is the number of elements in the horizontal direction and the number of Y-electrodes is the number of elements in the vertical direction. The reference value 41 is data for recording the measured value 42 in a non-touched status. The signal value 43 is data calculated on the basis of the measured value 42 in the touch detection process. The touch status management table 44 is a table for storing touch coordinates and the like as touch detection results.

The controller 103 calculates each capacity between the electrodes using the capacity detecting signal 203 of each electrode, and obtains input coordinates by computation using each capacity between the electrodes. The controller 103 transfers the input coordinates to a system controller 104 using an I/F signal 204.

If the input coordinates are transferred from the touch panel 400 by a touch operation, the system controller 104 generates a display image in accordance with the touch operation to be transferred to a display controlling circuit 105 as a display controlling signal 205.

The display controlling circuit 105 generates a display signal 206 in accordance with the display image transferred by the display controlling signal 205, and displays the image on the display device 600.



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Display device having touch panel patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Display device having touch panel or other areas of interest.
###


Previous Patent Application:
Controller architecture for combination touch, handwriting and fingerprint sensor
Next Patent Application:
Multi-touch panel capacitance sensing circuit
Industry Class:
Computer graphics processing, operator interface processing, and selective visual display systems
Thank you for viewing the Display device having touch panel patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.6502 seconds


Other interesting Freshpatents.com categories:
Nokia , SAP , Intel , NIKE ,

###

Data source: patent applications published in the public domain by the United States Patent and Trademark Office (USPTO). Information published here is for research/educational purposes only. FreshPatents is not affiliated with the USPTO, assignee companies, inventors, law firms or other assignees. Patent applications, documents and images may contain trademarks of the respective companies/authors. FreshPatents is not responsible for the accuracy, validity or otherwise contents of these public document patent application filings. When possible a complete PDF is provided, however, in some cases the presented document/images is an abstract or sampling of the full patent application for display purposes. FreshPatents.com Terms/Support
-g2-0.2219
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120092292 A1
Publish Date
04/19/2012
Document #
13270294
File Date
10/11/2011
USPTO Class
345174
Other USPTO Classes
International Class
06F3/044
Drawings
10



Follow us on Twitter
twitter icon@FreshPatents